Title:
RESOL TYPE PHENOLIC RESIN FOR WET FRICTION MATERIAL, PRODUCTION METHOD OF RESOL TYPE PHENOLIC RESIN FOR WET FRICTION MATERIAL, AND WET FRICTION MATERIAL
Document Type and Number:
Japanese Patent JP2015147885
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a wet friction material excellent in durability.SOLUTION: A resol type phenolic resin for a wet friction material is provided, in which the resol type phenolic resin has a weight average molecular weight of 100 or more and 500 or less and has a methylol group and an alkoxymethyl group in a chemical structure constituting the resol type phenolic resin. A production method of the resol type phenolic resin for a wet friction material is provided, which includes steps of: allowing phenols to react with aldehydes under basic conditions to obtain a reaction product having a methylol group; and allowing the obtained reaction product to react with alcohols to convert a part of methylol groups into alkyl ethers. A wet friction material is obtained by impregnating a fiber base material with the above resol type phenolic resin for a wet friction material.
Inventors:
MIBUKA GEN
Application Number:
JP2014022048A
Publication Date:
August 20, 2015
Filing Date:
February 07, 2014
Export Citation:
Assignee:
SUMITOMO BAKELITE CO
International Classes:
C09K3/14; C08G8/10; C08G8/28; C08J5/14; F16D69/02